CN1251230C - Recording device and recording method - Google Patents

Abstract

The main data recorded in the program area is divided into packets, and each packet is provided with a packet characteristic as a header for managing the packet data length, and a packet index as a management area for managing the data group in a batch manner when a plurality of packets are collected and managed as a data group. Therefore, when accessing, packet characteristics, which are headers included in each data group, are reproduced, and packet indexes, which are management areas in the inner periphery, are reproduced in advance, so that each packet included in the entire data group, which is a packet set, can be accessed.

Description

Recording device and recording method

technical field

The present invention relates to a recording medium which collectively records a plurality of packets recorded in a program area and has a management area which manages the aggregated packets in batches, a reproducing device which reproduces the above recording medium (data), and a recording device which records the above recording medium , reproduction method and recording method.

Background technique

In recent years, recording devices for recording video signals and audio signals of moving or still images taken by a user on a recording medium such as an optical disk or a magnetic tape have been known. In a conventional recording device, when a user captures an image, the recording position of each captured program is managed in a management area.

In this case, when using a normal optical disc, there is a problem that the number of manageable recording positions is limited in the management area called TOC (Table of Content: Table of Contents). That is, for example, when each 100K program is recorded on a recording medium with a capacity of 640M bytes, although about 6400 programs can be recorded, when the number of programs that can be managed in the actual management area is limited to 1000 programs, about 540M bytes will appear. The unfavorable situation that the recordable area remains on the optical disk cannot be used for recording results in a defect that the recording area cannot be effectively utilized.

1A and 1B show a disk map of a conventional optical disk and a management form table of a management area TOC. When three programs are recorded as shown in FIG. 1A, as shown in FIG. 1B, in the TOC, which is a management area, lists of recording start positions (start addresses) and recording end positions (end addresses) of each program are managed. However, when the management number is limited in the above-mentioned table, there is a disadvantage that recording cannot be performed even if a recordable margin remains in the recordable area, that is, the program area.

invention disclosure

In order to solve the above-mentioned problems, the object of the present invention is to provide a recording medium and a reproducing device for reproducing the recording medium. In the medium, the main data recorded in the program area is divided into packets, and each packet is equipped with a device for managing the data length of each packet. header (packet characteristics), and this medium also has a management area (packet index) that manages the above-mentioned packs in batches when a plurality of packs are aggregated into packs for management, so that when accessing, each At the same time, the header (packet property) included in the packet is reproduced in advance in the inner peripheral management area (packet index), so that each packet included in the entire packet (that is, the packet set) can be accessed.

Another object of the present invention is to provide a recording device that switches and manages a plurality of packets according to the quality of the recording object (that is, content), or manages each packet.

The recording medium of the present invention includes: a program area for discretely recording a data group composed of a plurality of unit data packets, each data packet is composed of a header and a main data part for managing the data length of the entire data packet; a first management area for recording addresses in the program area; and a second management area for managing the total number of packets and the total data length included in the data group composed of a plurality of packets.

The reproducing device of the present invention is used for reproducing the data of the recording medium, the recording medium includes: a program area for discretely recording a data group composed of a plurality of unit data packets, each data packet consists of a header that manages the data length of the entire data packet Consists of a main data section; a first management area that manages the recording addresses of the data packets in the program area; manages the total number of data packets and the total data contained in the data group formed by aggregating a plurality of data packets The second management area of the length; the reproduction device includes: reproduction means for reproducing the first management area, the second management area and the program area; storage means for playback management information; and control means for controlling the transfer of the playback means based on the management information stored in the storage means when access is commanded to any of the data groups composed of a plurality of data packets.

A recording device of the present invention is used for recording digital video signals on a recording medium, and the recording medium includes: a plurality of unit data packets composed of a header and a main data portion of recording management information are aggregated and then recorded discretely the program area; the management area for selectively recording the first management information and the second management information, the first management information includes the total number of data packets contained in the data group composed of the plurality of data packets and the The total data length contained in a data group composed of a plurality of data packets is composed, and the second management information is composed of the data length of each data packet; the recording device includes: a block for dividing the input digital video signal according to a predetermined length block means; judging means for judging the quality of the block digital video signal; when the judging means judges that the digital video signal is of low quality, first management information generation means for generating the first management information; in the The management area records recording means of the first management information generated by the first management information generating means.

A recording device of the present invention is used for recording digital audio signals on a recording medium, and the recording medium includes: a plurality of unit data packets composed of a header and a main data portion of recording management information are aggregated and then recorded discretely the program area; the management area for selectively recording the first management information and the second management information, the first management information includes the total number of data packets contained in the data group composed of the plurality of data packets and the The total data length contained in a data group composed of a plurality of data packets is composed, and the second management information is composed of the data length of each data packet; the recording device includes: a block for dividing the input digital audio signal into blocks according to a predetermined length block means; storage means for storing the digital audio signal of the block; judging means for judging the amount of data stored by the storage means; judging by the judging means that the digital audio signal of the block is stored in the storage means When it is more than a predetermined amount, first management information generating means for generating the first management information; recording means for recording the first management information generated by the first management information generating means in the management area.

A reproducing method of the present invention is used for reproducing a recording medium, and the recording medium includes: a program area for discretely recording a data group composed of a plurality of unit data packets, each data packet consists of a header and a data length for managing the entire data packet The main data section is composed of: a first management area that manages the recording address of the data pack in the program area; manages the total number of data packs and the total data length included in the data group formed by aggregating the plurality of data packs the second management area; the reproducing method includes the steps of: reproducing the first management area, the second management area and the reproduction step of the program area; a step of storing management information for area reproduction; a step of judging whether there is an instruction to access an arbitrary data group formed by aggregating a plurality of data packets; accessing arbitrary data specified by the access instruction based on the management information stored in the memory Package access steps.

A recording method of the present invention is used for recording digital video signals on a recording medium. The recording medium includes: a program area for discretely recording a data group composed of a plurality of unit data packets, and each data packet is managed by the entire data packet The header of the data length is composed of the main data part; the management area selectively manages the first management information and the second management information. The number of data packets and the total data length contained in the data group composed of the plurality of data packets, the second management information manages the data length of each data packet; the recording method includes the following steps: a step of digital video signal quality; a step of generating said first management information when it is judged in said judging step that said divided digital video signal is of low quality; recording said generated first management information in said management area information steps.

A recording method of the present invention is used for recording digital audio signals on a recording medium, the recording medium comprising: a program area for discretely recording a data group composed of a plurality of unit data packets, each data packet is managed by the entire data packet The header of the data length is composed of the main data part; the management area selectively manages the first management information and the second management information. The number of data packets and the total data length contained in the data group assembled by the plurality of data packets, the second management information manages the data length of each data packet; the recording method includes the following steps: inputting the number The step of dividing the audio signal; the step of storing the divided digital audio signal on the memory; the step of determining whether the storage amount of the digital audio signal stored on the memory is more than a predetermined amount; in the determining step A step of generating the first management information when it is judged that the storage capacity of the digital audio signal blocks in the memory is above a predetermined amount; and a step of recording the generated first management information in the management area.

Figure overview

1A and 1B are diagrams showing a disk map of a conventional optical disk and a management form of a management area TOC.

Fig. 2 is a schematic top view of a disk structure to which the present invention is applied.

Fig. 3 is a diagram showing the layout of each area of the disk.

Fig. 4 is a schematic diagram showing the TOC structure of the above disc.

Fig. 5 is a schematic diagram showing the composition of track identifiers and folder identifiers of the above disc.

Fig. 6 is a diagram showing an example of the folder hierarchical structure of the above-mentioned disc.

Fig. 7 is a schematic diagram showing the structure of the recordable area of the above disc.

Fig. 8 is a schematic diagram showing the construction of the above-mentioned disc program properties.

FIG. 9 is a schematic diagram of the structure of the data packet index table of the above-mentioned disc.

10A, 10B, 10C, 10D and 10E are schematic diagrams of the above-mentioned disk package index structure.

FIG. 11 is a schematic diagram of index attributes of the above-mentioned disc.

Fig. 12 is a schematic diagram showing the structure of the AV pack on the above disc.

Fig. 13 is a block diagram of an information recording/reproducing apparatus for recording/reproducing information on the disc.

Fig. 14 is a flowchart showing the procedure of track access control performed by the system controller of the information recording and reproducing apparatus.

15A and 15B are diagrams showing the disk map of the above-mentioned disk and the management form of the management area TOC.

Fig. 16 is a flow chart showing the procedure for generating a packet index of each packet by the system controller of the information recording and reproducing apparatus.

The best form for carrying out the invention

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The present invention is applied to the disc 10 constructed as shown in FIGS. 2 and 3, for example.

In this disc 10, from the inner peripheral side, the lead in area (Lead in area) 11, the pre-management area (Pre-mastered area) 12, the recordable area 14, and the order of the lead out area (Lead out area) 15 are set. information recording area. A transition area 13 is provided between the pre-management area 12 and the recordable area 14 . The pre-management area 12 may also not be provided.

The lead-in area 12 is composed of a PTOC area in which a pre-managed TOC (PTOC: Pre-mastered TOC) is repeatedly recorded throughout the area.

The PTOC is a non-rewritable TOC, and records the physical characteristics of the disc and management information of the pre-management data area. But management information is not used when RTOC is present. PTOC repeatedly records the data sector whose physical sector address (PSA: Physical Sector Address) is zero in the physical cluster in which the lower two bits of the physical cluster address (PCA: Physical Cluster Address) of the PTOC area are zero as the leading sector. .

The pre-management area 12 is constituted by a pre-management data area in which master information prepared at the time of manufacture is recorded.

The recordable area 14 is composed of an RTOC (Recordable TOC) area 14A and a recordable data area 14B. In the RTOC area 14, three sets of RTOC and recording power calibration areas are provided. The RTOC is a rewritable TOC for recording physical characteristics of the disc and management information of the pre-management data area and the recordable data area. However, PTOC is used when the recordable data area is not used. The RTOC is recorded three times at a position 16 PCA forward from the front of the RTOC area.

Master information is recorded in the above-mentioned pre-management area 12 and recordable area 14 .

Information is not recorded in the lead-out area 15 of the disc 10 .

In the disc 10, the TOC is a collection of all information records required for disc physical property recording and management of all tracks and folders on the disc. A set of TOCs has a length of 64 TOC blocks.

As shown in Figure 4, there are media descriptor (MED: Medium Descriptor), format descriptor (FOD: Format Descriptor), track allocation table (TAT: Track Allocation Table), track description table (TDT: Track Description) in a set of TOC. Table).

Set the media descriptor (MED) and format descriptor (FOD) in the top TOC block (TBNO). In the following TOC block, track allocation table (TAT) and track description table (TDT) are set, and the starting position and scale are specified by the format descriptor. Write 0 in the unused area in TOC.

Here, the TOC block is a data sector present in the PTOC or TROC. Each TOC block is assigned a block number (TBN: TOC Block Number) of consecutive integer values starting from 0 from the head of the PTOC or RTOC to which it belongs.

The above-mentioned media descriptor (MED) describes the physical characteristics of the medium, which consists of 256 bytes, including: 4-byte media identifier, 1-byte disc type, 8-byte MED identifier, 3-byte Recordable area start address, 3-byte RTOC start address, 3-byte recordable data area start address, 3-byte lead-out area start, 1-byte recording power 1 and 1-byte recording power2.

A byte string representing the format of the disc is recorded in the media identifier (BPO) field.

In the disc type (BP4) field, a code indicating the disc type (read-only disc, recordable disc, hybrid disc) is recorded.

Data indicating that this logical block is a media descriptor is recorded four times in the MED identifier (BP8) field.

In the recordable area start address (BP17) field, the recordable area start address is recorded.

The RTOC start address is recorded in the RTOC start address (BP21) field.

The start address of the recordable data area is recorded in the recordable data area start address (BP25) field.

In the lead-out area start address (BP29) field, the lead-out area start address is recorded.

In the recording power 1 (BP32) field, record the recommended value of the laser output when recording at the standard linear velocity.

In the recording power 2 (BP33) field, record the recommended value of the laser output when recording at twice the linear speed.

The format descriptor (FOD) above records the media logical format information, which consists of 256 bytes, including: 2-byte format version, 2-byte allocation unit size, 2-byte TAT position, 2-byte TAT size , 2-byte TDT position, 2-byte TDT size, 2-byte maximum number of TDT items, 2-byte pre-management allocation number, 2-byte number of recordable allocation units, 2-byte unallocated Can record the number of distribution units, 1 byte modification producer code, 1 byte modification type prototype, 2 byte modification serial number, 4 byte modification date and time, 4 byte creation date and time, 2 character section boot record, 2-byte identifier, and 64-byte identifier name.

The version number of this specification is recorded in the format version (BP0) field.

The number of logical blocks contained in one allocation unit is recorded in the allocation unit size (BP2) field.

In the TAT position (BP4) field is recorded the TOC block number where the track allocation table (TAT) starts.

The number of TOC blocks used by the track allocation table (TAT) is recorded in the TAT (BP6) field.

In the TDT position (BP8) field is recorded the TOC block number where the track description table (TDT) starts.

The number of TOC blocks used by the track description table (TDT) is recorded in the TDT size (BP10) field.

The maximum TDT item number actually used is recorded in the TDT item maximum number (BP12) field.

The number of allocation units located in the pre-management data area is recorded in the pre-management allocation unit number (BP16) field.

The total number of allocation units located in the recordable data area is recorded in the recordable allocation unit count (BP20) field.

The number of allocation units located in the recordable data area but not used is recorded in the unallocated recordable allocation unit number (BP22) field.

The number assigned to the maker of the device that rewrote the RTOC last is recorded in the revised maker code (BP24) field.

In the modification type code (BP25) field, the number assigned to the manufacturer of the device that rewrote the RTOC last is recorded. 0 in the pre-management FOD.

A value obtained by adding 1 to the previous value at each rewriting of the RTOC is recorded in the modification sequence number (BP26) field. It can be used to detect multiple RTOC mismatches.

The date and time when the RTOC was last recorded is recorded in the modified date and time (BP28) field.

The date and time at which the RTOC was first recorded are recorded in the Creation Date and Time (BP32) field.

An allocation unit AUN having a boot record is recorded in the Boot Record (BP36) field.

In the identification number (BP38) field, the number for identifying the disc is recorded.

An ASCII character string representing a disc name is recorded in the identification name (BP40) field.

The Track Allocation Table (TAT) is a table that records the status of all allocation units on the disc. TAT is set in consecutive TOC blocks. The top TOC block number of the TAT and the guaranteed number of TOC blocks are recorded in the format descriptor (FOD).

Each item of the TAT table has a number that increases continuously from zero.

A series of allocation unit numbers storing a track of data can be obtained from the following sequence.

1. The first allocation unit number can be obtained from the data position field value of the track descriptor indicating the track.

2. Check the state of the allocation unit from the item corresponding to the track allocation table (TAT). If a value from 0001h to FFEFh, then that value is the next allocation unit number, so sequence 2 applies again. If it is any value from FFF8h to FFFFh, this is the final allocation unit.

In principle a project is not linked to multiple projects. However, a maximum of 8 tracks can be linked only if the item is an allocation unit of the last part of the track. At this time, the number of links is managed in the entries of the track allocation table (TAT). Usually, the final allocation unit of a link is represented by FFFFh. If the number of links increases by 1, it is updated to a value obtained by subtracting 1 from the previous value (for example, updated from FFFFh to FFFEh). Conversely, if the number of links decreases by 1, the value is updated to the value obtained by adding 1 to the previous value. During the transition from FFFh state to No Link, the allocation unit returns to the unused state.

The track description table (TDT) is a table that stores track descriptors, folder descriptors, or unallocated track descriptors describing information such as track data storage locations and parent-child relationships between tracks and folders.

A track description table (TDT) is provided on consecutive TOC blocks. The leading TOC block number and the guaranteed number of TOC blocks are recorded in the format descriptor. One item is 16 bytes, and the total number of items of the track description table (TDT) is a multiple of 128. The length of the track description table (TDT) is determined during initialization and will not be changed later. The maximum length of the Track Description Table (TDT) is 43 TOC blocks, 5504 entries. To each item, as shown in Table 1 below, consecutively increasing numbers from No. 0 are assigned, and a track descriptor or format descriptor is stored thereon.

Table 1 Channel description table

BP +0

00000h Project 0 (for unassigned project folders)

00010h Item 1 (for root folder)

00020h Item 2

00030h Item 3

: :

157F0h Item 5503

A descriptor describing the root folder is set in item number 1 (item 01). All folders and paths are configured under the tree rooted at this folder. The identification number of the root folder is 0, which is not linked to the next one, and acts as the parent folder itself.

Item number 0 is provided with an unallocated track descriptor as a child virtual folder, and a folder descriptor describing an unallocated item folder. The sub-track descriptor of this folder means the unallocated track descriptor with the smallest number. Its identification number is 0, and it is not linked to the next one. As the parent folder itself, it also has system and hidden attributes.

The unallocated track descriptor is a virtual track indicating an unused item. The next track descriptor means an unallocated track descriptor with the next largest entry number.

After item number 2, any track descriptor or folder descriptor can be set.

The track descriptor is set in the track description table (TDT), and is used to describe the storage location and hierarchical relationship of the attribute data of a certain track. As shown in Figure 5, it consists of 2-byte attribute, 2-byte spare, 2-byte content type, 2-byte identification number, 2-byte data location, 2-byte data length, 2-byte It consists of 16 bytes including the parent folder descriptor of the section and the next track descriptor. The item number of the actually stored track description table (TDT) is the descriptor.

The attribute of this track is recorded in the attribute (BP0) field. The folder bit must be 0.

The kind of data stored in the track is recorded in the content type (BP4) field.

A numerical value uniquely identifying the track in the parent folder is recorded in the identification number (BP6) field.

In the data position (BP8) field, the allocation unit number storing the top data of the track is recorded. When the number is 0000h, the track has no actual data, and the data length field is 0.

The number of allocation units storing the track data is recorded in the data length (BP10) field. When the number is 0, there is no actual data in this track, and the data location field is also 0000h.

In the parent folder descriptor (BP12) field, record the descriptor of the parent folder.

The Next Track Descriptor (BP14) field is used to link tracks/folders having the same parent folder as the track in a list starting with the parent folder. In this field, record the descriptor of the track or folder to be retrieved next time.

All tracks and folders, as shown in Table 2 below, have attributes represented by 2-byte bit fields.

Table 2: Properties

bit description content

0 read-only 0 or 1

1 hidden 0 or 1

2 System 0 or 1

3 Folder 0 or 1

4 archive 0 or 1

5-6 Copyright Management 0, 1, 2, 3

7 Not written 0 or 1

8 non-relocatable 0 or 1

9- Adjacency 0, 1, 2, 310

11- spare 0

15

If the read-only (bit 0) field is 1, the disk/folder is read-only and cannot be deleted. In the case of a disc, data modification is also prohibited.

If the hidden (bit 1) field is 1, the existence of the disk/folder is unknown to the device user.

If the system (bit 2) field is 1, the disk/folder is a system component.

If the folder (bit 3) field is 1, the element is a folder. If the field is zero then the element is a disk.

The archive (bit 4) field is set to 1 when the data, attributes, and parent-child relationship change, and each device can be set to zero at any time.

Copyright management (bits 5-6) records copyright management information (CGMS) related to the disc data in codes shown in Table 3 below.

Table 3: Copyright Management

value description

0 can be copied without limit

1 Do not set copyright management information

2 Only 1 generation can be copied

3 cannot be copied

The Unwritten (Bit 7) field may contain logical clusters in the allocation unit ensuring that the recordable track has not been written with a DRL signal. In the case of a pre-managed channel, must be zero.

The non-relocatable (bit 8) field does not change the location and order of the allocation units storing the track data. In the case of pre-management, this bit must be 1.

The adjacency (bits 9-10) field assigns the block allocation strategy to the track record by the code shown in Table 4 below. Its application depends on the actual installation of each device.

Table 4: Adjacency

value description

0 Not specified

1 shall consist of a single allocation unit block

2 The largest possible allocation unit block should be configured in the order of allocation unit numbers

3 Define the configuration method suitable for the application

The disc 10 can record up to 5502 items of information hierarchically and classifiedly through the Track Description Table (TDT) and Track Allocation Table (TAT) according to the track management system (TMS: Track Management System) for recording area allocation described below.

In this TMS, an allocation unit is a collection of one or more logical clusters of continuous physical addresses located on the same physical track in the pre-management data area and the recordable data area, and is the minimum unit of storage area management. Each allocation unit is assigned a unique, zero-based continuous integer value in the disk, that is, the allocation unit number (AUN).

An allocation unit consists of a logical cluster, and the AUN is consistent with the LCN.

The allocation unit of the pre-management area is called a pre-management allocation unit, and the allocation unit of the recordable area is called a recordable allocation unit.

A collection of more than one allocation unit with continuous physical addresses on the same physical track is called an allocation unit block.

The smallest unit of a group of information (images, music, computer programs, etc.) that TMS directly manages is called a channel. The attributes of a track are represented by a track descriptor. The data contained in a track is stored in zero or more allocation units arranged in any order at any location.

A track composed of only pre-managed allocation units is called a pre-managed track.

A track consisting only of recordable allocation units is called a recordable track. Tracks in which pre-administrative allocation units and recordable allocation units are mixed are not allowed.

In the track management system (TMS), a folder is a structure for managing a plurality of tracks as a group, and is represented by a folder descriptor. Each track or folder belongs to a certain folder (parent folder), and finally constitutes a tree structure with the root folder as the root.

Each track/folder has a unique identification number within the folder it belongs to. It is a 16-bit integer, and any value other than FFFFh can be used. By arbitrarily determining the allocation method of this value in advance, each application is associated with the data type, order, and the like. Each prop has a 16-bit integer representing the kind of data.

In order to realize the hierarchical structure and to define the retrieval order of tracks and folders, all tracks and folders are linked by two types of linked lists.

One class is a linked list representing the parent folder of each track/folder. From this it is immediately possible to know to which folder these tracks/folders belong. The other type is a linked list with the parent folder as the front end and sequentially linking the tracks and folders belonging to the folder. By doing this, you can define the search order of the tracks and folders in the folder and perform high-speed search.

Because all the tracks and folders on the disk are set in a tree structure starting from the root folder, the tracks on the disk can be uniquely identified according to the order of the folders in the path from the root folder and their own identification numbers. and folders.

An example of folder hierarchy is shown in Figure 6. The root folder has an ID of 0000h, and its subunits include three subunits: folder 0101h, track 0088h, and file 0201h. Although there are folders and tracks with the same ID in FIG. 6 , they all have different parent units and thus exist independently. The IDs of folders and tracks are equal to the item numbers (item #n) in the property table shown in FIG. 7 .

In the disc 10, as shown in FIG. 7, an area within 128 physical clusters from the first two physical tracks of the recordable area is used as a management track priority area, and tracks in which management information is recorded in this area are preferentially recorded.

A (file) volume index track is set in the management track priority area. The volume index track is a track for recording volume characteristics, program characteristics of all programs in the volume, and auxiliary data characteristics of folder characteristic auxiliary data in folders. The summary information of each AV packet constituting the program is also recorded in the index track.

The volume index track has information about the programs, folders and ancillary data contained within the volume. The size of the volume index track is 12 clusters, which are divided into three areas: 5-cluster property table, 5-cluster header table, and 3-cluster packet index table from the front. 1001h is assigned as an ID to the volume index track.

The property table is a collection of property items recording volume properties of the volume, properties of programs, folders and auxiliary data contained in the volume. One item is 32 bytes, and a total of 5120 items (5 clusters) are prepared. Items start with zeros, assigning feature item numbers incrementally.

Record volume characteristics in item number 0. Thereafter the properties of folders, programs and auxiliary data are recorded. At this time, these properties are recorded in items having item numbers equivalent to the lower 14 bits of the identification number of the corresponding folder or track. Zeros are recorded for items that are not used.

The program properties are recorded program properties in the structure defined as shown in FIG. 8 . The program feature consists of feature attribute, title table, item number, modification date and time, frame number, secret number, packet index item number, start dummy frame, end dummy frame, reference count, picture category code, video encoding method, audio It consists of various fields such as encoding method and ISRC.

Record the characteristic category identification information [record type, program type, importance, combination, quality level], etc. in the characteristic attribute field.

The record type in the attribute attribute field records the attribute type (program, folder, auxiliary data, file, spare) stored in the item. The program type is valid when the property is a program property, and the type of program (audio program, still picture (audio) program, still picture (silent) program, moving picture (silent) program, moving picture program, backup) is recorded. The degree of importance is valid when the characteristic is a program characteristic, and it is recorded as a numerical value from 0 to 3. Usually 0 is recorded, meaning the least important. The combination is valid when the attribute is a program attribute. If it is 1, the time stamp (timestamp) recorded in the program AV data packet may be discontinuous. The quality level is valid when the characteristic is a program characteristic, recording the disc transfer speed required to reproduce the program seamlessly.

In the title table item number field, the top item number in the title table storing actual data corresponding to the program title (data name) is recorded. Log 0 when not used.

In the modification date and time field, record the time when the content and order of the corresponding program track, program characteristics and TMS attributes are changed last.

In the field of the number of frames, the number of video frames of the entire program is recorded for moving picture programs, and the number of audio frames reproduced as audio for still picture programs and audio programs is recorded.

In the password field, record the password of the corresponding program in four BCD. "0000" means not used.

In the data packet index item number field, record the first data packet index item number corresponding to the program. Log 0 when not in use.

In the start dummy frame field, for the first AV data packet of the corresponding program, the number of frames not displayed before is recorded. 0 is recorded when there is no special definition.

In the end dummy frame field, for the last AV data packet of the corresponding program, the number of frames that are not displayed at the end is recorded. 0 is recorded when there is no special definition.

In the reference count field, record the number of programs and program chains that refer to the corresponding program track. Usually record 1, the number increases by 1 each time a program chain is generated for the program, and the number decreases by 1 each time a program chain is deleted.

In the program category code field, the category code provided by the user for the corresponding program is recorded.

The contents recorded in the video encoding method field are the same as those recorded in the packet characteristics of the AV packets constituting the corresponding program.

The contents recorded in the audio encoding method field are the same as those recorded in the packet characteristics of the AV packets constituting the corresponding program.

An International Standard Recording Code for copyright management is recorded in the IRSC field.

In the title table of the volume index track, the titles of the respective programs, folders and auxiliary data are registered.

In the pack index table of the file index track, information on the data amount and reproduction time of the corresponding pack is recorded. The data packets constituting a certain program may have a data packet index for each data packet or a continuous group of data packets. The packet index table is an area where the packet index is recorded. In the data packet index table, as shown in FIG. 9 , 16384 data packet index items each of 4 bytes are placed. Among the packet index items, the top item is set to zero to provide the packet index item numbers in ascending order. Any packet index is stored in each packet index item.

It is assumed that the logically continuous data packet index information constituting a certain program is also logically continuous in the index table. That is, must be physically contiguous or linked by link pointer index (link pointer index). Record the link pointer index in the unused item, and connect with the index number of the top packet being zero.

There are 5 types in the data packet index, that is, moving image data packet index, moving image data group index, sound data packet index, sound data group index, and link pointer index, each of which is a 4-byte definition structure.

Moving picture data packet index, as shown in Figure 10A, is made up of four bytes such as index attribute (1 byte), data packet size (1 byte), spare (1 byte), video frame number (1 byte) . The moving picture pack index corresponds to a moving picture pack constituting a moving picture program or an AV pack constituting image data of a still picture program.

As shown in Fig. 10B, moving picture data set index is by index attribute (1 byte), data packet size sum (1 byte), data packet number (1 byte), video frame sum (1 byte) etc. four Byte composition. The group of moving picture data corresponds to a plurality of consecutive moving picture packets constituting a moving picture program.

As shown in FIG. 10C , the audio packet index is composed of four bytes including index attribute (1 byte), packet size (1 byte), spare (1 byte), and video frame number (1 byte). The sound pack index corresponds to a sound pack constituting a sound program or audio data constituting a still picture program.

As shown in FIG. 10D , the sound data group index is composed of four bytes including index attribute (1 byte), sum of packet size (1 byte), and sum of audio frames (2 bytes). The sound data group index corresponds to a plurality of consecutive sound data packs constituting the sound program.

As shown in FIG. 10E, the link pointer index is composed of four bytes including index attribute (1 byte), spare (1 byte), and next item number (2 bytes). The link pointer index does not correspond to any actual AV pack, but is prepared for logically linking items located at separate positions on the pack index table. This index is also used to join all unused items.

The first byte of the packet index is an index attribute having the structure shown in FIG. 11 defined commonly for each category. In the high-end four bits of the first byte of each data packet index, record the index type indicating the type of data packet index (moving image data packet index, moving image data group index, sound data packet index, sound data group index, link pointer index) , recording the mark bit and edit bit on its lower four bits.

If the flag bit is 1, it means that the packet contains flags.

If the edit bit is 1, it means that the corresponding AV data packet is the beginning of recording or the beginning of connection. The time stamp of this packet is not continuous with the previous AV packet.

In the packet size of the aforementioned packet index and audio packet index, the field value of the same name in the packet property of the corresponding AV packet is recorded as it is. In the video frame number, the field value of the same name located in the packet item of the corresponding AV packet is recorded as it is.

In the total packet size of the video packet index and the audio packet index, the total value of the packet size in the packet characteristics of the corresponding AV packets is recorded. The total number of video frames in the packet characteristics of the corresponding AV packets is recorded in the total video frames.

In the audio frame number of the above audio pack index, the value of the field with the same name in the pack property of the corresponding AV pack is recorded as it is.

In the total audio frames indexed by the above-mentioned audio data group, the total value of the number of audio frames in the pack property of the corresponding AV pack is recorded.

In the next entry number of the link pointer index, the entry number stored in the pack index corresponding to the next AV pack of the program is recorded.

In the recordable area 13 of the disc 10, AV packets are recorded as information bodies.

An AV packet is composed of an integer number of allocation units that are continuous both physically and logically. The structure of one packet is shown in FIG. 12. Packet characteristics such as recording conditions are set at the head of the packet, and then audio recording and video recording are recorded in order. The start position of each record is an integer multiple of 4 bytes from the front of the data packet, and an unused area of any length in which 0 is recorded can be set before and after it.

The data packet characteristic is composed of a data packet characteristic header and a plurality of data packet characteristic tables.

The data packet characteristic header placed at the front of the data packet characteristic consists of a data packet identifier (8 bytes), a data packet ID (4 bytes), a format version (2 bytes), a data packet size (1 byte), a data It is composed of 16 bytes including the packet characteristic table number (1 byte).

In the packet marker, the record indicates the pattern (00h, 00h, 00h, 00h, FFh, FFh, 00h, 00h) at the head of the packet.

In the pack ID, an ID (41h, 56h, 70h, 6Bh) indicating that the pack is an AV pack is recorded.

Record the current version code (0101h) in the format version.

In the packet size, the total length of the packet is recorded in units of clusters.

In the data packet characteristic table number, record the data packet characteristic table number included in the data packet characteristic. Since the AV information table always exists, this value must be 1 or more.

The packet property table records information related to audio recording and video recording included in the AV packet, VBI data, and text and graphics data (TBD) to be reproduced simultaneously. Although the AV information table must be recorded at the top, other tables are optional, and any table can be recorded in any order. However, in a data packet characteristic, the data packet characteristic table of the same type cannot be recorded multiple times. Each table has a variable length, and a table ID and a next table pointer are placed at the front.

FIG. 13 is a block diagram showing the configuration of an information recording and reproducing apparatus 100 for recording and reproducing information on a disc 10 .

This information recording and reproducing apparatus 100 includes: an audio data input/output unit 111 for inputting and outputting audio data, a video data input/output unit 121 for inputting and outputting video data, and a unit for generating reference signals to the audio data input/output unit 111 and the video data input/output unit 121. Sampling reference signal generation unit 131, audio compression and expansion unit 112 for compressing and expanding audio data, memory 113 for temporarily storing audio data, video compression and expansion unit 122 for compressing and expanding video data, memory 123 for temporarily storing video data, controlling audio data and video A data transfer control unit 132 for data transfer, a memory 133 for temporarily storing data controlled by the data transfer control unit 132, a recording/reproduction unit 134 for recording data on the disk 10 for reproduction, a system controller 136 for controlling the above-mentioned parts, and a Program ROM 137 and work RAM 138 of system controller 136 .

The information recording and reproducing device 100 is a magneto-optical recording and reproducing device for recording and reproducing information on a disc 10 constituted by a magneto-optical recording medium. The above-mentioned recording/reproducing unit 134 includes: an encoding/decoding circuit 341 for encoding and decoding data, a magnetic head driving circuit 342 for driving the magnetic head 342a, a laser head 343 for irradiating laser light to the disk 10 and detecting its reflected light, The RF amplifier 344 that reproduces the focus error signal (FE), the push-pull signal (PP) and the magneto-optical reproduction signal (MO) by reflected light reproduces the guide groove formed in the disc 10 based on the push-pull signal (PP) from the RF amplifier 344. Groove oscillates corresponding signal and the address decoder 345 of ADIP decoding, the spindle motor 346 that drives disk 10, the thread mechanism 347 that drives above-mentioned magnetic head 342a and laser head 343 in the radial direction of disk 10, according to above-mentioned RF amplifier 344 The focus error signal (FE) and the push-pull signal (PP) etc. control the servo circuit 348 of focus servo, tracking servo, thread servo and spindle servo.

In this information recording and reproducing apparatus 100 , the disk 10 is rotationally driven by a spindle motor 346 . During recording/reproducing, the laser head 343 irradiates the disc 10 with laser light. During recording, the laser head 343 outputs high-level laser light to heat the recording track up to the Curie temperature, and during reproduction, outputs low-level laser light to detect data from reflected light using the magnetic Kerr effect.

For this purpose, the laser head 343 is equipped with an optical system including a laser diode as a laser output means, a polarizing beam splitter, an objective lens, and the like, a detector for detecting reflected light, and the like. The objective lens 343a is held movably in the disc radial direction and in the front-rear direction by the biaxial mechanism 343b.

The magnetic head 342 a is disposed at a position opposite to the laser head 343 with the disk 10 interposed therebetween. The magnetic head 342 operates to apply a magnetic field modulated by the supplied data to the disc 10 .

The entire laser head 343 and the magnetic head 342a can be moved in the disc radial direction by the screw mechanism 347 .

During playback operation, the information detected by the laser head 343 from the disc 10 is supplied to the RF amplifier 344 . The RF amplifier 344 performs arithmetic processing on the supplied information to extract the reproduced RF signal, tracking error signal TE, focus error signal FE, groove information GFM (absolute position information recorded on the disc 10 as a front groove (wobble groove)) and the like.

The extracted reproduced RF signal is supplied to the encoding/decoding section 341 . The tracking error signal TE and the focus error signal FE are supplied to the servo circuit 348 , and the groove information GFM is supplied to the address decoder 345 .

The servo circuit 348 is based on the focus error signal (FE), the push-pull signal (PP) and the track jump (transition) command, access command and rotation speed detection information of the spindle motor 346 from the system controller 136 composed of a microcomputer. , generate various servo drive signals, control the two-axis mechanism 343b and the screw mechanism 347, thereby controlling focus and tracking, and control the spindle motor 346 to a constant linear velocity.

The address decoder 345 decodes the supplied slot information GFM, thereby extracting address information. This address information is provided to system controller 136 for various control actions.

Coding/decoding section 341 binarizes the magneto-optical reproduction signal (MO) provided by RF amplifier 27, demodulates with EFM (eight-fourteen modulation) mode, and then uses CIRC (cross interleaved Reed-Solomon coding; interleaved Reed -Solomon encoding) to perform error correction decoding processing. The AV data decoded by the encoding/decoding unit 341 such as EFM demodulation and CIRC is temporarily written in the buffer memory 33 by the data transfer control unit 32 .

The audio data read out from the buffer memory 33 is supplied to the audio companding processing section 12 , and the video data is supplied to the video companding processing section 22 . The encoding/decoding unit 341 adds a CIRC-based error correction code to the recording signal supplied from the data transfer control unit 32 , further performs modulation using the EFM method, and supplies the recording signal to the magnetic head drive circuit 342 . The reproduced RF signal is subjected to decoding processing such as EFM demodulation and CIRC in the encoding/decoding unit 341 , and at this time, addresses, subcodes, etc. are also extracted and provided to the system controller 36 .

The recording system of the information recording and reproducing apparatus 100 operates as follows.

That is, the audio data input/output unit 111 samples externally input audio data with a predetermined code length based on the reference signal generated by the sampling reference signal generation unit 131 and outputs an audio sample signal. The video data input/output unit 121 samples externally input video (moving image or still image) data with a predetermined code length based on the reference signal generated by the sampling reference signal generating unit 131, and outputs a video sampling signal.

The audio compression and expansion unit 112 temporarily stores the audio sampling signal of the audio data input and output unit 111 in the memory 113, reads a predetermined number of data as a group, and converts it into Audio efficiently encodes signals.

The video compression and expansion unit 122 temporarily stores the video sampling signal of the video data input and output unit 121 in the memory 23, reads a predetermined number of data as a group, and converts it into a high-efficiency video coding signal by a high-efficiency coding method such as MPEG.

The data transfer control unit 132 temporarily stores the signals output from the audio compression and expansion unit 12 and the video compression and expansion unit 22 at irregular intervals in the memory 33 . Thereafter, according to an instruction from the system controller 136, each signal is read from the memory 133 in predetermined units, multiplexed, and then identification information is added. The identification information-added signal is output at a transfer rate and timing suitable for the recording/reproducing unit 134 . However, multiplexing and addition of identification information can also be performed at the time of storage in the memory 133 .

In the recording/reproducing unit 34, according to the instruction of the system controller 136, an error correction code is added to the recording signal provided by the data transmission control unit 32 in the CIRC method, and then modulated in the EFM method and provided to the head drive circuit 342. signal to record data on the disk 10. At this time, the system controller 136 provides a control signal to the laser head 343 to output laser light at a recording energy level.

The reproducing system of the information recording and reproducing apparatus 100 operates as follows.

That is, the recording/reproducing unit 134 binarizes the magneto-optical reproduction signal (MO) read from the disk 10 in accordance with an instruction from the system controller 136, performs demodulation by the EFM method, and further performs error correction decoding by the CIRC method. processing, thereby reproducing the AV data. The AV data is temporarily written in the buffer memory 33 by the data transfer control unit 132 . Data reading from the disc 10 by the laser head 343 and reproduction data transfer from the laser head 343 to the buffer memory 33 system are performed at a rate of 8.7 Mbit/s and are usually performed intermittently. The data written in the buffer memory 33 is read out at a timing such that the reproduction data transfer rate is 0.3 Mbit/sec (ATRAC), 4-8 bit/sec (MPEG). Audio data is supplied to the audio companding processing unit 112 , and video data is supplied to the video companding processing unit 122 .

The audio compression/expansion unit 112 expands the input signal in the reverse order of compression, stores it in the memory 113, reads it out in the order of recording, and outputs it as an audio sample signal. Also, the video compression/expansion unit 122 expands the input signal in the reverse order of compression, stores it in the memory 123, reads it out in the order of recording, and outputs it as a video sampling signal.

Thereafter, the audio data input/output unit 111 converts the audio sampling signal output from the audio compression/expansion unit 112 into an audio signal based on the reference signal generated by the sampling reference signal generation unit 31, and outputs the audio signal to the outside. The video data input/output unit 121 converts the video sampling signal output from the video compression/expansion unit 122 into an image signal based on the reference signal generated by the sampling reference signal generation unit 131, and outputs it to the outside.

The system controller 136 in the information recording and reproducing apparatus 100 is composed of, for example, a CPU, etc., and performs control operations shown in the flowchart of FIG. Programs and the like for realizing various operations of the recording/reproducing apparatus 100 are stored in the program ROM 28 connected to the system controller 136 described above. Data and programs necessary for the system controller 136 to perform various processes are appropriately held in the work RAM 29 .

Specifically, first, the system controller 136 reproduces RTOC information from the RTOC area on the disc 10 mounted in the information recording and reproducing apparatus 100 (step S1), and stores the reproduced RTOC information in the work RAM 140 (step S2).

Then, the above-mentioned system controller 136 generates the track/folder number, data allocation and data length in the above-mentioned working RAM 140 according to the track/folder descriptor contained in the track description table (TDT) in the track management system (TMS). table (step S3).

Next, the system controller 136 reproduces the management track priority area in the recordable data area shown in FIG. 7 (step S4).

Next, the system controller 136 refers to the item number contained in the packet index table in the volume index track corresponding to the above-mentioned track/folder number, extracts the packet index item number contained in the corresponding program characteristic, and generates the Item number table (step S5).

Furthermore, the system controller 136 refers to the entry number included in the packet index table in the volume index track corresponding to the above packet index item, and distinguishes the packet (moving image/audio)/data group (moving image) according to the index attribute. /sound) (step S6).

The system controller 136 obtains the data packet size, video frame or total data packet size, data packet number, and video frame number and stores them in the working RAM 140 (step S7).

Next, the system controller 136 waits for the access command for the user (step S8), and refers to the item number in the property table of the working RAM 140 according to the ID corresponding to the track indicated by the access command. The packet index entry number in the program profile corresponding to the referenced entry number is referred to. The system controller 136 judges whether the packet index corresponding to the packet index item number is a packet (moving image/sound) or a data group (moving image/sound) based on the index characteristic (step S9).

In the above-mentioned step S9, the discrimination result is a data group, that is, when the indicated track of the access instruction is a data group index (moving image/sound), the system controller 136, according to the track/folder number, data distribution and data length of the working RAM 140 The table starts to access according to the data allocation and data length corresponding to the track number indicated by the access instruction (step S10).

Next, the system controller 136 reads out the total size and number of packets included in the packet index (moving image/sound) in the working RAM 140, and substitutes them into variables x, y (step S11).

The packet size included in the packet characteristics reproduced after access is substituted into variable a (step S12).

Since the access to a packet constituting the data group index has been completed, the variable y is decremented by 1 (step S13), and it is determined whether the variable y is 0 (step S14).

In the above step S14, the determination result is "No", that is, when the variable y is not 0, it is determined that the access to all the data packets constituting the data group index has not been completed. To recalculate the total data length of the remaining packets constituting the packet index, the system controller 136 sets the variable x to be x-a (step S15).

Then, it is judged whether there is an access instruction to the next data packet (step S16), if there is an access instruction to the next data packet, then only the variable a (ie the size of the data packet) is transferred (step S17).

The system controller 136 determines whether the variable x is 0 (step S18).

In the above-mentioned step 18, the determination result is "no", that is, when the variable x is not 0, it is judged that the access of all data packets forming the data group index has not been completed, the system controller 136 returns to step S12, and repeats the processing of steps S12 to S18, The channel pointed to by the access instruction is accessed.

If the determination result in the above-mentioned step S14 or S18 is "Yes", that is, when the variable y is 0 or the variable x is 0, it is judged that the access to all the data packets forming the data group index has been completed, and the system controller 136 ends the access command. Refers to the access conducted by the Tao.

If the discrimination result of above-mentioned step S9 is " data packet ", promptly when the path that access command points is data packet (moving image/sound), system controller 136, from the path/folder number, data distribution in above-mentioned work RAM140 and the data length table, read out the data allocation, data length and packet size corresponding to the track number indicated by the access command, and access the track indicated by the access command (step S19).

In the system controller 136 of the information recording and reproducing apparatus 100, as shown in the management form of the disk map and the management area TOC shown in FIG. 15A and FIG. 15B, a header is added to each program recorded in the program area, and the The data length of each program. Furthermore, a plurality of program groups are grouped into one data group, and the recording start position (ie, the recording start position a of program 1) at the head of the above-mentioned data pack is managed in the RTOC. In the management track priority area, the number of packets included in one aggregated packet and the total data length (total packet size) of the entire packet are managed. In this example, as shown in FIG. 15B, the number of packets is 3, so (t1+t2+t3) is managed as the total packet size. In this way, by managing a plurality of programs in batches, tables in the management area can be saved.

When each of a plurality of files (packets) handled as a data group is managed as a "data group *** index", each packet does not need to be dually managed as a "data group *** index". "***" above indicates moving picture or sound.

In the information recording apparatus 100, the system controller 136 generates a packet index of each packet according to the flowchart of FIG. 16 .

Specifically, the system controller 136 generates recording information according to a predetermined predetermined format (step S41), and determines whether the data is in a moving image mode (step S42).

If the determination result of step S42 is "Yes", that is, if it is in moving image mode, the system controller 136 then determines whether the data packet is in low rate mode (step S43 ).

If the determination result of step S43 is "No", that is, when it is determined to be in the high-speed mode, the system controller 136 generates an independent index of the data packet, that is, a data packet index (step S45 ). And when the determination result of the above-mentioned step S43 is "Yes", that is, when it is determined to be in the low-rate mode, the system controller 136 generates an index of an information record group composed of a plurality of continuous data packets, that is, a data group index (step S46).

If the determination result of the above-mentioned step S42 is "No", that is, if it is the voice mode, it is determined whether or not a predetermined amount of data is input (step S44).

If the determination result of step S44 is "No", that is, if the predetermined amount of data has not been input, an independent index of the data packet, ie, a data packet index, is generated (step S47 ). If the determination result is "Yes", that is, if a predetermined amount of data is input, an index of an information record group composed of a plurality of consecutive data packets, that is, a data group index is generated (step S48).

As described above, by batch-managing a plurality of files (packets) of low-quality images as pack indexes, limited pack indexes for managing packs can be saved. Furthermore, by automatically switching the management file with the group index or the management file with the pack index according to the data amount of the digital audio signal stored in the memory, consecutive digital audio signals can be managed in batches using the group index.

Claims (8)

1. A recording device, which is used to record digital video signals on a recording medium, wherein the recording medium comprises: a plurality of unit data packets composed of the header of the recording management information and the main data portion are gathered and then dispersed The program area to be recorded selectively; the management area for selectively recording the first management information and the second management information, the first management information is the total number of data packets contained in the data group composed of the plurality of data packets and the total data length contained in the data group composed of the plurality of data packets, the second management information is composed of the data length of each data packet; the recording device includes: Blocking means to block the input digital video signal according to the predetermined length; Judging means for judging the quality of the block digital video signal; first management information generating means for generating the first management information when the judging means judges that the digital video signal is of low quality; Recording means for recording the first management information generated by the first management information generating means in the management area. 2. The recording device according to claim 1, further comprising: second management information generating means for generating said second management information when said judging means judges that said digital video signal is of high quality; The recording means records the second management information generated by the second management information generating means in the management area. 3. A recording device for recording digital audio signals on a recording medium, characterized in that the recording medium comprises: a plurality of unit data packets formed by the header of the recording management information and the main data part are gathered and then dispersed The program area to be recorded selectively; the management area for selectively recording the first management information and the second management information, the first management information is the total number of data packets contained in the data group composed of the plurality of data packets and the total data length contained in the data group composed of the plurality of data packets, the second management information is composed of the data length of each data packet; the recording device includes: Blocking means to block the input digital audio signal according to a predetermined length; storage means for storing said segmented digital audio signal; judging means for judging the amount of data stored in the storage means; First management information generating means for generating the first management information when the judging means judges that the divided digital audio signal has been stored in the storage means to a predetermined amount or more; Recording means for recording the first management information generated by the first management information generating means in the management area. 4. The recording device according to claim 3, further comprising generating said second management when said judging means judges that said divided digital audio signal is stored in storage means below a predetermined amount. Second management information generating means for information; the recording means records the second management information generated by the second management information generating means in the management area. 5. A recording method for recording digital video signals on a recording medium, characterized in that the recording medium comprises: a program area for discretely recording a data group composed of a plurality of unit data packets, each data packet is managed by The header of the data length of the entire data packet is composed of the main data part; the management area selectively manages the first management information and the second management information, and the first management information manages all data in the data group composed of the plurality of data packets The total number of data packets contained and the total data length contained in the data group composed of the plurality of data packets, the second management information manages the data length of each data packet; the recording method includes the following steps: The step of dividing the input digital video signal; The step of judging the quality of the digital video signal of the blocks; A step of generating the first management information when it is judged that the divided digital video signal is of low quality in the judging step; A step of recording the generated first management information in the management area. 6. recording method as claimed in claim 5, is characterized in that, also comprises the following steps: A step of generating the second management information when the judging step judges that the divided digital video signal is of high quality; A step of recording the generated second management information in the management area. 7. A recording method for recording digital audio signals on a recording medium, characterized in that the recording medium comprises: discretely recording a program area of a data group composed of a plurality of unit data packets, each data packet is managed by The header of the data length of the entire data packet is composed of the main data part; the management area selectively manages the first management information and the second management information, and the first management information manages all data in the data group composed of the plurality of data packets The total number of data packets contained and the total data length contained in the data group composed of the plurality of data packets, the second management information manages the data length of each data packet; the recording method includes the following steps: the step of dividing the input digital audio signal; the step of storing said segmented digital audio signal on a memory; a step of determining whether the storage amount of the digital audio signal stored in the memory is greater than a predetermined amount; A step of generating the first management information when it is judged in the judging step that the digital audio signal storage capacity of the block on the memory is more than a predetermined amount; A step of recording the generated first management information in the management area. 8. recording method as claimed in claim 7, is characterized in that, also comprises the following steps: A step of generating the second management information when the judging step judges that the storage capacity of the divided digital audio signal on the memory is less than a predetermined amount; A step of recording the generated second management information in the management area.

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